稀土尾矿对再生骨料混凝土性能的影响

    Effect of Rare Earth Tailing on Properties of Recycled Aggregate Concrete

    • 摘要: 这是一篇陶瓷及复合材料领域的文章。为进一步提高稀土尾矿利用率,本研究以稀土尾矿砂为细骨料设计制备了C30再生骨料混凝土,研究了尾矿砂的掺量对再生骨料混凝土的工作性、力学性能及耐久性的影响。实验结果表明:以稀土尾矿砂为细骨料能够制备出满足标准要求的C30及C40混凝土,随着尾矿砂掺量的增加,混凝土工作性降低,但完全采用尾矿砂作为细骨料的混凝土的和易性可达到使用需求。随着尾矿砂掺量的增加,混凝土微观孔隙结构致密化,抗压强度得到提高,当尾矿砂掺量为100%时混凝土的28 d抗压强度提升了34.9%。尾矿砂的掺入改善了混凝土的抗冻性能及抗碳化性能。

       

      Abstract: This is an essay in the field of ceramics and composites. In order to improve the utilization rate of rare earth tailings, this study designed and prepared C30 recycled aggregate concrete with rare earth tailings as fine aggregate. The influence of tailing sand content on workability, mechanical properties and durability of recycled aggregate concrete was studied. The results show that C30 and C40 concrete can be prepared by using rare earth tailing sand as fine aggregate to meet the requirements of the standard. With the increase of tailing sand content, the workability of concrete decreases, but the workability of concrete using tailing sand as fine aggregate can meet the requirements of use. With the increase of tailing sand content, the micro-pore structure of concrete becomes densified and the compressive strength is improved. When tailing sand content is 100%, the 28 d compressive strength of concrete is increased by 34.9%. The addition of tailing sand improves the frost resistance and carbonation resistance of concrete.

       

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